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Re: Howto debug failing Apache Frontend request ?
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You cannot use the parameters apache_custom_http or apache_custom_https

Except my this, it is good. 

Those parameters requires approval and review from the instance owner (if you are using VIFIB, you must open a ticket for this), so if you request like this you get probably blocked. (this is like this for security reasons).

I think you can request several slaves for the same thing, and using "url" and "path" parameters.

Regards, Rafael